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Effect of dry heating on egg white powder influencing water mobility and intermolecular interactions of its gels
Author(s) -
Cheng Yuan,
Wang Juntong,
Chi Yuan,
Ma Zihong,
Geng Xuhao,
Chi Yujie
Publication year - 2020
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.10652
Subject(s) - hydrogen bond , chemical engineering , intermolecular force , chemistry , egg white , network structure , ionic bonding , materials science , molecule , organic chemistry , engineering , ion , machine learning , computer science
BACKGROUND Dry heat processing remains the most promising and simple approach for achieving better gelling properties of spray‐dried egg white powder (EWP). Water mobility and intermolecular interactions in gels derived from EWP were investigated after subjecting EWP to various dry heating times (0–21 days). RESULTS The gel hardness and water‐holding capacity significantly increased with an increase in dry heating time ( P < 0.05), and both parameters were positively correlated with gel transparency. In contrast to the coarser structure of untreated EWP gel, the gel of EWP corresponding to 15 days of dry heating time had a fine‐stranded and orderly network structure with smaller pores. An increase in the binding force between the gel and water was observed with an increase in dry heating time due to the formation of more ‘protein–water’ hydrogen bonds. Increasing the dry heating time resulted in an increase in the contribution of disulfide bonds, which in turn made a significant contribution to the rigidity of the EWP gels. By contrast, a decrease in the contribution of ionic bonds and hydrophobic interactions upon increasing the dry heating time promoted the formation of orderly networks. CONCLUSIONS Overall, gel corresponding to EWP dry heating for 15 days had better gel properties, the highest transparency and water‐holding capacity, as well as a fine‐stranded and orderly network structure. These results provide more information on improvement of the gel properties of EWP through dry heat treatment. © 2020 Society of Chemical Industry